But T-Mobile USA has yet to bring the iPhone to their network in any official capacity, in part because their 3G network uses a different radio frequency band than AT&T and the rest of the world, one that current iPhone hardware does not support.

Unlocked iPhone owners will be quite familiar with this limitation, as unlocked devices built for AT&T’s network will fall back to 2G EDGE service when used with a T-Mobile USA sim card. Read more